Greetings Ricardox Martinez. When an issue is resolved, the issue is closed. As for the doubt that you have raised in the previous topic, personally the physical earth (which for this case would correspond to the protective earth) would not connect to the screw in green color that you indicate and which in turn can be screwed so much in the neutral bar as in the cabinet to keep wizards communicated with each other. It is not the right place to do it. If you want to ground the cabinet as a safety or security measure, what you would have to do is fix or screw a screw to the metal cabinet itself and at a distance from both the phase connections and the neutral connections. That way your Load Center will be complete and at the time of touching it you will not receive a discharge because it is already grounded to the javelin for protective earth that will be used for grounding of the appliances cabinets. There are countries where their electrical system is different from that of Mexico and where they do indeed connect the protective earth to the neutral as it is intended to illustrate in the explanations that you have read in that Load Center, but in Mexico you have to respect the names by the Entity which in this case is CFE. Do not close the tma yet, giving the opportunity for the Technicians of that country who participate in this Forum to delve you better in this regard, since they know the standards much better by CFE and can clear your doubts much better. Thanks and regards. PD .___ In relation to the images, if you are uploading them through the icon related to images, keep in mind that the maximum allowed value is about 2000 Kb. On the other hand, the image title should not have any accent on the words that they are usually accentuated, because the language used on the web does not accept it. Thank you. Edited on 07-11-2019. Statement by Ricardox Martinez: I hope you can appreciate the images .. My question is the following: On the CC label, mention that the screw uses it and screw it into the neutral bar, in case of using physical ground (that's what I understand). In that case, I was already joining neutral and not earth? I understand that I don't have to join them in the load center ... The other image is the charging center for 220V that I have in my home Observations by btvictor: Greetings Ricardox. I definitely wouldn't do it. It is unfortunate that the entity responsible for supervising the information that is provided to the user, allows to pass information that induce misinterpretations and generate problems. The Load Center you illustrate in the image uploaded to the Forum shows that both phases (Phase1 and Phase2) and the neutral are isolated from the cabinet. And that is correct. [/B] Think for a moment that either in a washing machine, or in a microwave, or in a dryer, there will be a leak of one of the two phases to their respective cabinets and that because of bad milk, there are ground discharges of the appliances installed and in operation in the property for not including the driver for the discharge protection earth in the different circuits installed in the property. He would attempt against the life of whoever touches the corresponding cabinet. Now consider that all appliances as well as the Load Center cabinet are connected to the protective earth conductor accordingly and in the Load Center the screw in green color allows the neutral to be in contact with the cabinet of that Load Center as you interpret it in what you have read from the information that accompanies that cabinet. As there is a current leakage of at least one of the phases, there will be an explosion in the Load Center that will have a negative impact on both the phase involved and the neutral in the building. [b] As there is no main neutral available at the Load Center , appliances powered with phase-to-neutral voltage of approximately 120 VAC will experience adverse situations with minor or very serious damage, as the case may be when they are powered with a voltage of about 240 VAC approx (phase1 and phase2) and all due to a misinterpretation in the use given to the green screw shown in one of the two images that you have uploaded to the Forum. And here again I emphasize the information that is attached to those electrical products and which looks like it is not really supervised properly to avoid damage where they are going to be used. Repairing a Load Center involves taking out the cabinet and that represents a great cost and unnecessary time that can be avoided taking into account that in the power supply in a property you have phases, neutral landed to the service ground as well as the land of protection for cabinets in appliances, motors, etc. I just hope that the above will allow you to clarify the doubt you have raised about it and keep in mind not to mix the service land that involves the neutral with the protective ground for both the cabinets of appliances and engines. Thanks and regards.